基于泄漏电流高次谐波比的电缆护层保护器老化状态评估  

Aging State Assessment of Cable Sheath Protector Based on High⁃order Harmonic Ratio of Leakage Current

作　　者：方春华[1] 李放 张怡琳 庄立 胡涛 孙奥琪 张瑶 吕俊杰 FANG Chunhua;LI Fang;ZHANG Yilin;ZHUANG Li;HU Tao;SUN Aoqi;ZHANG Yao;LYU Junjie(School of Electrical and New Energy,China Three Gorges University,Hubei Yichang 443002,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《高压电器》2024年第12期152-159,共8页High Voltage Apparatus

基　　金：电网环境保护国家重点实验室开放基金资助项目(GYW51202201415)。

摘　　要：氧化锌电缆护层保护器是电力系统中保证电缆供电安全的重要设备,其运行状态将直接影响到线路安全。由于长期受到各种过电压的影响,电缆护层保护器极易发生老化,导致其性能发生明显劣化。基于泄漏电流分析的状态检测对于预测电缆护层保护器的老化状态具有重要作用。文中采用雷电冲击老化的方法,研究了电缆护层保护器冲击老化后的高频特性,提出了基于泄漏电流高次谐波比的老化状态诊断检测指标,该指标随老化程度的加深呈现逐渐增大的趋势。因此,能够用来有效评估电缆护层保护器的老化状态,为电缆护层保护器老化状态检测提供技术支撑。The zinc oxide cable sheath protector in power system is an important equipment to assure the safety of the cable supply and its operating condition will directly affect the safety of the line.Due to the long⁃term influence of various overvoltages,the cable sheath protector is susceptible to aging,resulting in significant deterioration of its per⁃formance.The leakage current analysis⁃based condition detection is important for predicting the aging state of the ca⁃ble sheath protector.In this paper,the high frequency characteristics of the cable sheath protector after impact aging are studied by using the lightning impulse aging method,and a diagnostic test index for the aging state based on the high harmonic ratio of the leakage current is proposed,which tends to increase gradually with the increase of aging.Therefore,it can be used to effectively assess the aging state of the cable sheath protector and provide technical sup⁃port for the detection of the aging state of the cable sheath protector.

关 键 词：电缆护层保护器 老化状态 泄漏电流 高频特性 谐波比 

分 类 号：TM75[电气工程—电力系统及自动化]